Block B1 is a locality within Janakpuri, West Delhi, Delhi. Block B1 has a pincode of . Nearby localities of Block B1 include Block B1, Nangli Jalib, District Centre, Block B2, BB Block, Possangipur, Block B 3B, Chhoti Subji Mandi, Block B 3A, Block BE, Block BD, Shiv Nagar, Narang Colony, Chander Nagar, Gurunanak Pura, Virender Nagar, Shiv Nagar Extension, Block C2A, Block A3, Block C2B, Block A 2B, Hari Nagar, Asalatpur Village, Block A 2A, Block BF, Block C2C, Block C1, Block AB, Block C 4E, Block A1, Block A2, Block A1B, Block C4G, Block A1A, Block C 2D, Block C-5A, C5B Block, Block C5D, Block C5B, Block C5C, RWA Colony, Tihar Jail, Tihar Central Jail, Block C6B, Desu Colony, Janakpuri Institutional Area, Lajwanti Garden, Pocket D 1, Nangal Raya, Gurjar Samrajya Chowk, Block B3, Janakpuri District Center, Prem Nagar, C-2 Block, Block C4F, Block C4H, Block C3A, Block C3, Block C 6A